66920825 has 12 divisors (see below), whose sum is σ = 83984208. Its totient is φ = 52890000.

The previous prime is 66920813. The next prime is 66920863. The reversal of 66920825 is 52802966.

It is not a de Polignac number, because 66920825 - 2²⁰ = 65872249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14051 + ... + 18200.

It is an arithmetic number, because the mean of its divisors is an integer number (6998684).

Almost surely, 2^66920825 is an apocalyptic number.

It is an amenable number.

66920825 is a deficient number, since it is larger than the sum of its proper divisors (17063383).

66920825 is a wasteful number, since it uses less digits than its factorization.

66920825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32344 (or 32339 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 66920825 is about 8180.5149593409. The cubic root of 66920825 is about 405.9947603811.

The spelling of 66920825 in words is "sixty-six million, nine hundred twenty thousand, eight hundred twenty-five".